/*
 * Copyright (c) 2013 Ambroz Bizjak
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef AMBROLIB_CHOOSE_FIXED_FOR_FLOAT_H
#define AMBROLIB_CHOOSE_FIXED_FOR_FLOAT_H

#include <aprinter/meta/BitsInFloat.h>
#include <aprinter/meta/FixedPoint.h>

namespace APrinter {

template <int Bits, bool Signed, typename FloatValue>
struct ChooseFixedForFloat__Helper {
    static_assert(FloatValue::value() > 0.0, "");
    static constexpr double Power = __builtin_ldexp(1.0, -Bits);
    static constexpr double FixedValue = FloatValue::value() * (1.0001 / (1.0 - Power));
    static int const Exp = BitsInFloat(FixedValue) - Bits;
    using Result = FixedPoint<Bits, Signed, Exp>;
};

template <int Bits, bool Signed, typename FloatValue>
using ChooseFixedForFloat = typename ChooseFixedForFloat__Helper<Bits, Signed, FloatValue>::Result;

}

#endif
